#include <stdio.h>
int main() {
  char s[1000];
  int f[26] =  {
    0
  };
  while (gets(s)) {
    int len = strlen(s), i;
    for (i = 0; i < len; i++)
      if (isalpha(s[i]) && isupper(s[i]))
        f[s[i] - 'A']++;
      else if (isalpha(s[i]) && islower(s[i]))
        f[s[i] - 'a']++;
  }
  int i;
  for (i = 0; i < 26; i++)
    printf("%c: %d\n", 'a' + i, f[i]);
}
